Add members to your group
1. Open Outlook.
2. Under Groups in the left pane, select your group.
3. Click the Group Settings drop down and select Add Members.
4. In the Add people box, search for people within your organization either by entering their full name or email address, and then select the names to add.
Tip: If you want to add multiple people at the same time, add the names or email addresses, separated by a semicolon.
5. Click OK.